Avenc del Sifó

A narrow circular mouth (0.5 m in diameter) gives access to a small one-metre drop. At the base a low gallery with a sandy floor begins, which after 3 metres opens out, on the left-hand side, into a chimney that ends after 6 metres of vertical ascent (+ 5 m with respect to the mouth). Three metres further on, the gallery, now high, ends in a chamber with abundant wall concretion but with few stalactites, and these concentrated only at the W end. This chamber can be considered the first level, since by means of two drops, one next to the access gallery and the other, narrower, at one end of the chamber, they place us on an intermediate level, heavily concreted on the ceiling and walls. We continue descending and reach a chamber whose floor is covered with stones and which has a narrow passage communicating with the intermediate level. It is in this place that the maximum depth of the cavity is found. Total depth: 15 m (-10;+5).

The final chamber has abundant wall concretion but few stalactites, concentrated only at the W end. The intermediate level is heavily concreted on the ceiling and walls.